Williston Water Quality
North Dakota
According to EPA SDWIS, Williston, North Dakota is served by 5 community water systems covering about 32,054 people. The same extract lists 1 health-based violation record, most recently coded 5200 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Williston, North Dakota is delivered through 5 EPA-regulated community water systems serving an estimated 32,054 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 1 violation record across the 5 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 1 distinct EPA contaminant code: LEAD AND COPPER RULE REVISIONS. 8 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the North Dakota drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| WILLISTON CITY OF | 26,426 | 0 | Clean |
| NORTHWEST RURAL WATER DISTRICT | 5,102 | 0 | Clean |
| INSPIRE COMMUNITIES-SPRINGBROOK | 300 | 0 | Clean |
| PRAIRIE VIEW HOA | 226 | 1 | Health |
| WESTERN AREA WATER SUPPLY AUTHORITY | 0 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| PRAIRIE VIEW HOA | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
What are Williston's health-based records for?
Every health-based violation record in Williston carries one EPA contaminant or rule code. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Lead and Copper Rule Revisions | 1 | 1 |
TRI Facilities in Williston
| Facility | Total Releases |
|---|---|
| Stateline Complex | 24.9K lbs |
| Championx-Williston | 12.0K lbs |
| Halliburton Williston Field Camp (halwest) | 9.6K lbs |
| Sabin Metal West Corp | 321 lbs |
| Thomas Petroleum LLC - Williston North Bulk Plant | 0 lbs |
| Halliburton Williston Field Camp | 0 lbs |
| Knife River North Central Williston | 0 lbs |
| Halliburton Williston Baroid | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Williston, North Dakota? ▼
How many water violations does Williston have in this EPA extract? ▼
What contaminants were found in Williston water? ▼
How many water systems serve Williston? ▼
Where does Williston get its drinking water? ▼
Are there pollution sources near Williston? ▼
How does Williston compare in North Dakota?
Of the 236 North Dakota places with at least one community water system on file, Williston ranks #11 by number of systems (5).
Either side of it: Horace (5), Mandan (5), Turtle Lake (4), Cavalier (3)
About This Data
Figures here are the current EPA SDWIS extract joined to the 5 community water systems whose service area lists Williston, ranked against the 236 North Dakota places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.